UCC3837DG4

Overview

The UCC3837DG4 is an 8-pin N-FET linear regulator controller in a SOIC-8 package. It operates from input voltages as low as 3V and provides high current levels for custom processor voltages below 3V. The device features an on-board charge pump to drive external N-MOSFETs, achieving extremely low dropout voltage. Electrical characteristics include a 1.5V reference, 90mV typical current sense comparator offset at 25°C, and a supply current of 1.5mA at VDD=5V. Operating temperature range is 0°C to 70°C.

Feature Summary

• On-board charge pump creates gate drive voltage for external N-channel MOSFET pass transistors
• Duty ratio mode overcurrent protection limits average power dissipation during fault conditions
• Capable of operating with input voltages as low as 3V for efficient linear regulation
• Low external parts count design optimized for custom logic level voltages

Applications

• Custom processor voltage generation
• Bus termination voltage regulation
• Logic level voltage supplies below 3V

Procurement Notes

Verify the UCC3837DG4 status as LIFEBUY before finalizing designs. Confirm that the SOIC-8 package dimensions match the target PCB footprint. Ensure the application environment remains within the specified 0°C to 70°C operating temperature range. Validate that the external N-MOSFET selection aligns with the internal charge pump drive capabilities.

Selection Notes

Select this controller when designing low dropout linear regulators using external N-channel MOSFETs. It is suitable for applications requiring input voltages near 3V and output voltages below standard 3-terminal regulator ranges. Designers must account for the charge pump impedance and external gate capacitance to ensure stable transient response and proper loop compensation.

Part Context

The UCC3837DG4 belongs to the UCC3837 family of linear regulator controllers manufactured by Texas Instruments. It is part of a series that includes variants like the UCC1837 and UCC2837, differentiated primarily by their industrial or commercial temperature ratings. The 'G4' suffix indicates lead-free packaging compliant with RoHS standards.

Replacement Considerations

Public confirmed substitutes: UCC3837D.